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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 965 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.1 + ? = 10
  2. 2.2 + ? = 10
  3. 3.26 + ? = 100
  4. 4.5 + ? = 10
  5. 5.21 + ? = 100
  6. 6.56 + ? = 100
  7. 7.53 + ? = 100
  8. 8.89 + ? = 100
  9. 9.6 + ? = 10
  10. 10.9 + ? = 10
  11. 11.81 + ? = 100
  12. 12.8 + ? = 10
  13. 13.75 + ? = 100
  14. 14.66 + ? = 100
  15. 15.4 + ? = 10
  16. 16.38 + ? = 100
  17. 17.34 + ? = 100
  18. 18.25 + ? = 100
  19. 19.30 + ? = 100
  20. 20.7 + ? = 10
  21. 21.41 + ? = 100
  22. 22.54 + ? = 100
  23. 23.43 + ? = 100
  24. 24.3 + ? = 10
  25. 25.19 + ? = 100
  26. 26.85 + ? = 100
  27. 27.65 + ? = 100
  28. 28.67 + ? = 100
  29. 29.80 + ? = 100
  30. 30.84 + ? = 100
  31. 31.12 + ? = 100
  32. 32.11 + ? = 100
  33. 33.31 + ? = 100
  34. 34.44 + ? = 100
  35. 35.20 + ? = 100
  36. 36.17 + ? = 100
  37. 37.70 + ? = 100
  38. 38.22 + ? = 100
  39. 39.61 + ? = 100
  40. 40.35 + ? = 100

Answer key

  1. 9
  2. 8
  3. 74
  4. 5
  5. 79
  6. 44
  7. 47
  8. 11
  9. 4
  10. 1
  11. 19
  12. 2
  13. 25
  14. 34
  15. 6
  16. 62
  17. 66
  18. 75
  19. 70
  20. 3
  21. 59
  22. 46
  23. 57
  24. 7
  25. 81
  26. 15
  27. 35
  28. 33
  29. 20
  30. 16
  31. 88
  32. 89
  33. 69
  34. 56
  35. 80
  36. 83
  37. 30
  38. 78
  39. 39
  40. 65

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